package com.daisyday.demo;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class HasmMapDemo {
    public static void main(String[] args) {
        Map<String,Object> map=new HashMap<String,Object>();
        map.put("k","v");
        Map<String,Object> map1=new ConcurrentHashMap<String,Object>();

    }
}
